iliocostal muscle il·i·o·cos·tal muscle (ĭl’ē-ō-kŏs’təl) n. The lateral division of the erector muscle of the spine, having three subdivisions: the lumbar iliocostal muscle, the thoracic iliocostal muscle, and the cervical iliocostal muscle.

iliofemoral il·i·o·fem·o·ral (ĭl’ē-ō-fěm’ər-əl) adj. Relating to the ilium and the femur.

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